Malicious PDF — malware analysis report

Static analysis result for SHA-256 85390ccd608fced0…

MALICIOUS

PDF

84.0 KB Created: 2021-03-23 13:05:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8e623baa7bd54cf3ade848890e9ba60a SHA-1: 173331a9ae4e7c22b81b81114f0839ae8f9b8e9a SHA-256: 85390ccd608fced0fe77d90e6c9d8553a30388b79c8facd4d7f56afe99d558a6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gimoguvi.ru/award?keyword=adjective+phrase+quiz+pdf PDF link annotation
    • https://rosififobagas.weebly.com/uploads/1/3/1/1/131164218/2378861.pdfIn PDF document text
    • http://lezofifividex.scienceontheweb.net/683454231.pdfIn PDF document text
    • https://dibumofum.weebly.com/uploads/1/3/5/3/135313591/28ad1d0acf110.pdfIn PDF document text
    • https://piladokad.weebly.com/uploads/1/3/4/7/134759874/jefedebijasagok.pdfIn PDF document text
    • https://nibuwoxemunovox.weebly.com/uploads/1/3/4/7/134714338/e3ce518.pdfIn PDF document text
    • http://xinuvaro.sportsontheweb.net/8145597368.pdfIn PDF document text
    • http://erse.xyz/cheese_burst_pizza_dominos_adp96oo.pdfIn PDF document text
    • http://pogadai.xyz/658813187808kj0a.pdfIn PDF document text
    • https://fiwirilo.weebly.com/uploads/1/3/4/0/134096979/gujuwibavob_kazexupuzomigu.pdfIn PDF document text
    • https://xedonafu.weebly.com/uploads/1/3/4/4/134486379/5ea5d3e49b4.pdfIn PDF document text
    • http://stepka2016.xyz/government_advertising_definition_economics0thtz.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/zopewekutezuzif.pdfIn PDF document text
    • http://mewudaguzexo.sportsontheweb.net/types_of_distributed_operating_system.pdfIn PDF document text
    • http://evilcheats.fun/practice_makes_perfect_complete_spanish_grammar_onlineva3ej.pdfIn PDF document text
    • https://befewegumezozem.weebly.com/uploads/1/3/1/4/131453636/7519385.pdfIn PDF document text
    • https://saxarewuvopa.weebly.com/uploads/1/3/4/8/134855039/2451346.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://729282ec-1290-4cbc-9302-cf8a24acd4c7.filesusr.com/ugd/42c189_83cae645d3574448a26003b700a66b3e.pdf?index=trueIn PDF document text
    • http://rupesujutiwu.myartsonline.com/cadena_de_suministro_ejemplo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/355fe480-1410-40d5-97de-892c3df2ddb0/kenmore_90_series_dryer_thermal_fuse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3835c19-0642-46c1-8196-20cba0244eb2/what_is_the_definition_of_dvar_torah.pdfIn PDF document text
    • https://cc67bef4-e22e-42fd-bf01-3f02b15f800b.filesusr.com/ugd/080020_dff231881ccb475990a65954e2585ac8.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6B 5512 bytes
SHA-256: 5b21dfe11d49c2ba1aba019a45c12c98175efcfc3eb242f134b9d62576b2611b
font_01_sfnt_off00011e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3C 10764 bytes
SHA-256: 3cf22170b44083cadc2c49e37ac97352bad3dc30fe2f2e960cfa7d50ffed17f4

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